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If you have a drill (or a lathe) with a 3 jaw chuck hold the front end lightly in that, then use a pair of pliers with a piece of rag in the jaws on the back end holding tight enough to undo it but not so tight that you mark or squash it.

You could do what rog said, you could also drop it in boiling water and let it sit for a while, (without the lens asembly of course) then take it out and grab a rag or something to hold it so it doesn't slip. Then twist as hard as you can.
I think using pliers would be easier than having to heat the module.

Are you turning it the right direction? Just joking. Try wrapping some grippy cloth or paper around the outside of both the head and the body and get two pairs of pliers. Then grip hard and twist. Use leverage to your advantage!

__________________You must spread some Reputation around before giving it to <person> again.

I remove the danger sticker first so I can re-use it on my new burner when I'm done. I usually use vise grips and pliers because it twist really easy and doesn't scratch plus I don't care if it does anyway. I saw the title of this thread and thought &quot;OHH NO!&quot; ;D Putting the new diode in the place of the old one (once you get that out) is the most challenging.

It took couple hours baking it in the car during afternoon and twisted it off with an anti slip mat.
on a side note,I seem to have lost the spring(the one fitted with the lens) during disassembly.
is the spring important?